Jointer for artificial-stone work



, G, P. Y.

JOINI'ER Poii ARTIFICIAL STONE WORK.

No. 361,692. Patented Apr. 26, 1887.

'Fig. 2 is a cross-section of the same.

NITED STATES ATENT Fries.

GEORGE F. GRAY, OF SAN FRANCISCO, OALlFORNIA.

JOlNTER FOR ARTIFICIAL-STONE woRK.

SPECIFICATION forming part Of Letters Patent No. 361,692, dated April 26,1887.

Applicution filcd November 11, 1886. Serial No. 218,056. (No model.)

To all whom, it may concern.-

-Be it known that I, GEORGE F. GRAY, of the city and county of San Francisco, State of California, have invented an Improvement in J ointers for Artificial-StonelVork; and I hereby declare the following to be a full, clear, and exact description of the same.

My invention relates to the class of tools or implements which are used in working with artificial stone in the laying of sidewalks, &c.; and my invention consists in a jointer for rapidly and accurately making the joints between the independent'blocks of artificial stone.

This jointer isa handled tool having projecting from the plane of its face and on the side thereof a knife or cutter, the outer side of which is perfectly straight.

The object and use of my invention will hereinafter appear.

Referring to the accompanying drawings for a more complete explanation of my invention, Figure 1 is a perspective view of my jointer. Fig. 3 is a plan by which the method usually employed in laying artificialstone work may be illustrated, in order to show the use of my jointer.

A is the body of the tool, provided with a handle, D. Projecting from the face of the tool on one side is a knife or cutter, b, the outer side of which is perfectly straight and forms one side of the jointer, While its inner side, which joins the main face, is slightly concaved, though this is not absolutely essential, as it may be straight, if desired.

The tool with a face such as described may be made in any suitable manner. I have here shown a simple construction in which the knife or cutter is formed on the lower edge of a plate, B, the rear end of which takes the handle D, while that portion of the face designated by c, and which may also be slightly concaved, is formed on the lower surface of a piece of block, 0, which is secured to the knife-plate by suitable bolts or screws, E.

In order to understand fully the use of this tool I refer now to Fig. 3, from which I will describe the manner or mode usually employed in laying artificial-stone, work.

F may be supposed to be the bed in which the stone-work is to be laid. It is divided transversely into main spaces f, separated by minor spaces f of less width-generally about one-half the width. All the spaces are separated, in the firstinstance, by guides or boundaries made of straight pieces of scantling, G. The main spaces are first filled in with the concrete or cement, thus forming the blocks the edges of which are defined by the scantling guides. When a block is filled in, the jointer is placed on the edge of the block, with its straight or perpendicular side against the side or edge of the scantling and its concave side against the edge of the cement-work. The tool is then passed along the scantling, its straight side close against it. The effect of this is to make the joint with the concave side of the knife, the remaining face, 0, of the tool properly rounding it. After these main blocks of artificial stone have sufficiently hardened the scantlings are removed, because they are no longer needed for guides, as the hardened edges of the main blocks serve this purpose. The intermediate minor spaces are then filled in with artificial stone right up to the edge of the main blocks. Thejointer is again taken, but in a reverse direction, so that its straight side now comes against thepreviously-prepared edge of the main block, while its opposite side moves along the fresh material of the minor block, thus making its joint the same as the main block. It will thus be seen that the tool makes but onejoint at a time.

I am aware of the existence of tools for stamping the margins of cement-work, and also for marking out. the smaller divisions of the blocks or stones, and which are known as creasers. I do not wish my invention confounded with these tools, as it is not used for the same purpose, and the purpose for which it is used requires such a change of construction in the tool as to render it adapted for its use, without which change it could not be used for the purpose of jointing. To illustrate this I refer particularly to a creaser sometimes used for marking the smaller divisionsof the main stone. This creaser has projectingfrom the center of its face a knife which is in crosssection what may be termed a hatchet shape, or approximately that of an inverted isosceles triangle having its sides concave.

It is obvious that such a tool could not be used for a jointer, for the reason that ithas not a straight edge, which is absolutely essential for working against the straight side of the scantling guide and against the previously 5 hardened and prepared joint of the alternate blocks, as I have described. For the same A jointer for artificial-stone work having projecting from one side only of the plane of 15 its face a single knife or cutter, having its outer side straightand forming one side of the tool and its inner side concave and joining and continuing the remaining face of said too1, substant-ially as herein described.

In witness whcrcof I have hereunto set my hand.

GEORGE F. GRAY. Witnesses:

S. H. NoURsE, WV. H. PATTERSON. 

